High-rigidity high-durability carbon fiber enhanced polyamide composite material and preparation method thereof

A composite material and carbon fiber technology, which is applied in the field of carbon fiber reinforced polyamide composite materials, can solve the problems of no composite material performance evaluation, large amount of solvent consumption, cumbersome process, etc., and achieve excellent bonding interface layer, good adhesion effect and simple process Effect

Active Publication Date: 2014-05-14
ZHEJIANG PRET NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101608064A describes a compound treatment method of electrochemical oxidation and coating sizing solution, the sizing solution is PA66 / nano silica hybrid slurry; CN102229747A uses polyacrylonitrile with the same chemical structure as carbon fiber precursor as Surface treatment agent; however, the above treatment methods have disadvantages such as cumbersome process and large amount of solvent, and there is no targeted evaluation of the performance of the composite material after carbon fiber surface modification in a humid and hot complex environment

Method used

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  • High-rigidity high-durability carbon fiber enhanced polyamide composite material and preparation method thereof
  • High-rigidity high-durability carbon fiber enhanced polyamide composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Soak 10 grams of short carbon fiber slices in an alkaline solution at 80°C for 10 minutes, spray 5 grams of polyurethane prepolymer aqueous emulsion with a solid content of 5% on the surface after filtration, put it in a vacuum drying oven, and dry it at 90°C with Dry under oxygen for 1 hour, then evacuate to 0.05MPa, heat up to 200°C, and heat for 2 hours to obtain surface-treated carbon fibers;

[0039] Dry 85g of polyamide resin at 100°C for 2 hours, weigh 5 grams of toughening agent and 0.2g of antioxidant, and mix them uniformly in a high-speed mixer to obtain a resin mixture;

[0040] The resin mixture is fed into the twin-screw extruder (screw diameter 35mm, length-to-diameter ratio L / D=36) through the main feed port, and the surface-treated carbon fiber is fed into the extruder through the side feed port. The section control temperature (from the feeding port to the nozzle outlet) is 220°C, 225°C, 230°C, 230°C, 230°C, 230°C, the speed of the twin-screw extruder ...

Embodiment 2

[0043] Soak 20 grams of short carbon fiber slices in an alkaline solution at 80°C for 30 minutes, spray 10 grams of polyurethane prepolymer aqueous emulsion with a solid content of 10% on the surface after filtration, put it in a vacuum drying oven, and dry it at 90°C with Dry under oxygen for 1 hour, then evacuate to 0.01MPa, heat up to 200°C, and heat for 2 hours to obtain surface-treated carbon fibers;

[0044] Dry 75g of polyamide resin at 100°C for 2 hours, weigh 5 grams of toughening agent and 0.3g of antioxidant, and mix them uniformly in a high-speed mixer to obtain a resin mixture;

[0045]The resin mixture is fed into the twin-screw extruder (screw diameter 35mm, length-to-diameter ratio L / D=36) through the main feed port, and the surface-treated carbon fiber is fed into the extruder through the side feed port. The section control temperature (from the feeding port to the nozzle outlet) is 220°C, 225°C, 230°C, 230°C, 230°C, 230°C, the speed of the twin-screw extruder...

Embodiment 3

[0048] Soak 20 grams of short carbon fiber slices in an alkaline solution at 80°C for 30 minutes, spray 10 grams of polyurethane prepolymer aqueous emulsion with a solid content of 20% on the surface after filtration, put it in a vacuum drying oven, and dry it at 90°C with Dry under oxygen for 1 hour, then evacuate to 0.01MPa, heat up to 200°C, and heat for 3 hours to obtain surface-treated carbon fibers;

[0049] Dry 65g of polyamide resin at 100°C for 2 hours, weigh 8 grams of toughening agent and 0.5g of antioxidant, and mix them uniformly in a high-speed mixer to obtain a resin mixture;

[0050] The resin mixture is fed into the twin-screw extruder (screw diameter 35mm, length-to-diameter ratio L / D=36) through the main feed port, and the surface-treated carbon fiber is fed into the extruder through the side feed port. stage control, the temperature (from feed inlet to nozzle outlet) is 220°C, 225°C, 230°C, 230°C, 230°C, 230°C, the speed of twin-screw extruder is 300 rpm A...

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Abstract

The invention discloses a high-rigidity high-durability carbon fiber enhanced polyamide composite material and a preparation method thereof. The high-rigidity high-durability carbon fiber enhanced polyamide composite material is prepared from the following raw materials by weight percent: 60-90% of polyamide resin, 5-10% of flexibilizer, and 10-30% of surface treated carbon fibers, wherein the surface treated carbon fibers are carbon fibers treated with a polyurethane prepolymer previously. Compared with the prior art, the high-rigidity high-durability carbon fiber enhanced polyamide composite material has the advantages that on one hand, no any solvent is used in the surface treatment process of the carbon fibers, the process is simple, the attachment effect of the polyurethane prepolymer on the surface of the fibers is good and an excellent bonding interface layer can be provided for the composite material, and on the other hand, the interface debonding phenomenon caused by factors such as moisture diffusion and thermal expansion is effectively prevented by virtue of effective fiber surface treatment, and as a result, the durability of the composite material in complex environments, especially under a high-humidity condition, is improved.

Description

technical field [0001] The invention relates to a carbon fiber reinforced polyamide composite material, in particular to a high rigidity and high durability carbon fiber (CF) reinforced polyamide (PA) composite material and a preparation method thereof. Background technique [0002] Polyamide (commonly known as nylon) is the largest amount of engineering plastics. It has excellent mechanical properties, high heat resistance and chemical resistance, good wear resistance, good self-lubrication, low friction coefficient, and creep resistance. Good properties, just correspond to the performance indicators required by auto parts, especially the peripheral parts of the engine. Therefore, the auto industry has become one of the main application fields of polyamide and its composite materials. [0003] As a new generation of high-performance reinforcing fiber, carbon fiber CF is famous for its light weight, high strength, high corrosion resistance and high heat resistance. It is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08K9/04C08K9/02C08K7/06
CPCC08L77/02C08L77/06C08L2201/08C08L51/00C08K9/04C08K7/06
Inventor 郑云龙陈永东张祥福周文
Owner ZHEJIANG PRET NEW MATERIALS
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